A novel replica placement strategy for video servers

Gafsi, Jamel;Biersack, Ernst W
IDMS 1999, International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services, October 12-15, 1999, Toulouse, France / Also published in LNCS, Volume 1718/1999

Mirroring-based reliability as compared to parity-based reliability significantly simplifies the design and the implementation of video servers, since in case of failure mirroring does not require any synchro- nization of reads or decoding to reconstruct the lost video data. While mirroring doubles the amount of storage volume required, the steep de- crease of the cost of magnetic disk storage makes it more and more attractive as a reliability mechanism. We present in this paper a novel data layout strategy for replicated data on a video server. In contrast to classical replica placement schemes that store original and replicated data separately, our approach stores replicated data adjacent to original data and thus does not require additional seek overhead when operating with disk failure. We show that our approach considerably improves the server performance compared to classical replica placement schemes such as the interleaved declustering scheme and the scheme used by the Microsoft Tiger video server. Our performance metric is the maximum number of users that a video server can simultaneously support (server throughput).


DOI
Type:
Conference
City:
Toulouse
Date:
1999-10-15
Department:
Digital Security
Eurecom Ref:
283
Copyright:
© Springer. Personal use of this material is permitted. The definitive version of this paper was published in IDMS 1999, International Workshop on Interactive Distributed Multimedia Systems and Telecommunication Services, October 12-15, 1999, Toulouse, France / Also published in LNCS, Volume 1718/1999 and is available at : http://dx.doi.org/10.1007/3-540-48109-5_26
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